Why was china during the tang dynasty a likely place for golden age to occur

It was the time of invention, innovation, and discovery: that is what the golden age is ... also the Tang dynasty was the most peaceful time in all of history of ancient China.

the golden age happened there because people;

discovered bronze/brass, and how to make alloys

Chinese paper

improvement in gunpowder production

exploration of the west

silk road relationship with western nations/countries